In a recent letter to Nature, Boothroyd and coworkers have shown that the well known hour-glass spectrum, previously observed in some cuprate materials, occurs in a hole doped material lying outside the family of cuprates. The material in question, La5/3Sr1/3CoO4, is a hole-doped insulating antiferromagnet whose magnetic dynamics can be unambiguously ascribed to stripes. The observation of an hour-glass dispersion in this material links that spectrum to the stripe order, which, in turn, strongly suggests that hour-glass spectrum in cuprates is due to stripes. Despite this breakthrough, a question remains over the dynamics of these stripes. Neutrons effectively take a snap-shot of this feature, but are insensitive to slow dynamics, necessitating the use of another probe. In this project we propose to make muSR measurements on La5/3Sr1/3CoO4 to probe the slow fluctuations of stripe order.